tz2.c File Reference

#include <grass/datetime.h>

Include dependency graph for tz2.c:

Go to the source code of this file.

Functions
int	datetime_change_timezone (DateTime *dt, int minutes)
	if dt has a timezone, increment dt by minutes-dt.tz MINUTES and set dt.tz = minutes Returns: 0 OK datetime_check_timezone (dt) if not -4 if minutes invalid More...
int	datetime_change_to_utc (DateTime *dt)
	Return datetime_change_timezone (dt, 0);. More...
void	datetime_decompose_timezone (int tz, int *hours, int *minutes)
	tz = abs(tz) *hour = tz/60 *minute = tz%60 Note: hour,minute are non-negative. Must look at sign of tz itself to see if the tz is negative offset or not. This routine would be used to format tz for output. For example if tz=-350 this would be hour=5 minute=50, but negative. Output might encode this as -0550: printf ("%s%02d%02d", tz<0?"-":"", hour, minute) More...

Function Documentation

datetime_change_timezone()

int datetime_change_timezone	(	DateTime *	dt,
		int	minutes
	)

if dt has a timezone, increment dt by minutes-dt.tz MINUTES and set dt.tz = minutes Returns: 0 OK datetime_check_timezone (dt) if not -4 if minutes invalid

Parameters

dt
minutes

Returns

int

Definition at line 21 of file tz2.c.

References datetime_error(), datetime_get_timezone(), datetime_increment(), datetime_invert_sign(), datetime_is_valid_timezone(), DATETIME_MINUTE, DATETIME_RELATIVE, datetime_set_minute(), and datetime_set_type().

Referenced by datetime_change_to_utc().

datetime_change_to_utc()

int datetime_change_to_utc

(

DateTime *

dt

)

Return datetime_change_timezone (dt, 0);.

Parameters

dt

Returns

int

Definition at line 59 of file tz2.c.

References datetime_change_timezone().

datetime_decompose_timezone()

void datetime_decompose_timezone	(	int	tz,
		int *	hours,
		int *	minutes
	)

tz = abs(tz) *hour = tz/60 *minute = tz%60 Note: hour,minute are non-negative. Must look at sign of tz itself to see if the tz is negative offset or not. This routine would be used to format tz for output. For example if tz=-350 this would be hour=5 minute=50, but negative. Output might encode this as -0550: printf ("%s%02d%02d", tz<0?"-":"", hour, minute)

Parameters

tz
hours
minutes

Returns

void

Definition at line 82 of file tz2.c.